Please please please help me

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

Use the formulas a = x 2 – y 2, b = 2xy, c = x 2 + y 2 to answer this question. one leg of a right triangle has length 11 and all sides are whole numbers. find the lengths of the other two sides. the other leg = a0 and the hypotenuse = a1

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?